JPH0645233Y2 - Vehicle restraint system - Google Patents

Description

[Detailed Description of the Invention] A. Field of Industrial Application The present invention relates to a vehicle restraint device configured to allow forward and backward movement of a vehicle on a chassis dynamometer.

B. Outline of the Invention A vehicle restraint system according to the present invention is a vehicle restraint system for restraining a wheel hub of a vehicle wheel on a chassis dynamometer. It is movable and allows not only horizontal and vertical movements of the vehicle but also forward and backward movements
It is designed so that tests closer to actual driving conditions can be performed.

C. Conventional technology Chassis dynamometers are widely used for tests of exhaust gas characteristics and fuel consumption characteristics, because experiments equivalent to running a vehicle on an actual road can be easily performed indoors with good reproducibility. . Recently, it is also being used for research and experiments on maneuverability and stability at high speeds.

However, there are many test items including the setting of absorption power, and if any one of them is inappropriate, the simulation of the chassis dynamometer becomes unsatisfactory.

Therefore, in order to improve reproducibility, a chassis dynamometer of a type in which not only a four-wheel drive vehicle but also a front-wheel drive vehicle or a rear-wheel drive vehicle is mounted on a load device and rotated is also developed. .

Conventionally, a wire rope has been used as a means for restraining a vehicle on such a chassis dynamometer. The vehicle is restrained by holding one end of each of the plurality of wire ropes at the front part and the rear part of the vehicle body of the vehicle and stretching the other end on the floor or the like.

However, this method of restraining the vehicle with the wire rope does not allow accurate measurement because the wire rope swings or the wire rope exerts a downward force on the vehicle as if the weight of the vehicle increases. However, there is a problem that the suspension and the tire may be deformed due to the vibration of the vehicle body due to the swing of the wire rope and the increase in the apparent vehicle body weight.

In order to avoid such a problem, a vehicle restraint system that restrains the wheel hub instead of the vehicle is actually opened.
No. 4545, No. 61-44546, and No. 61-44547. The vehicle restraint devices disclosed in these publications are
It has a structure in which an attachment mechanism portion that rotatably supports an attachment shaft that is fixed to a wheel hub is movably supported in the vertical and horizontal directions.

D. Problems to be Solved by the Invention In the vehicle restraint device described in the above publication, the mounting mechanism is movable in the vertical direction and the horizontal direction as described above, but is not movable in the front-back direction. Absent. That is,
It also restrains the longitudinal movement that occurs when the vehicle is suddenly started, suddenly stopped, suddenly accelerated, suddenly braked, etc. As a result, a force that does not act on the test vehicle in the actual traveling state. Accurate measurements could not be made.

E. Means and Actions for Solving the Problems In order to solve the above problems, according to the present invention, a mounting mechanism that rotatably supports a mounting shaft fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer. And a follow-up mechanism section for movably supporting the attachment mechanism section in the left-right direction and the up-and-down direction, in a vehicle restraint device, wherein the attachment mechanism section or the follow-up mechanism section or both are provided with a damper, and the attachment mechanism section is provided. Alternatively, since the follow-up mechanism portion or both of them can move in the front-rear direction, the movement of the vehicle in the front-rear direction is allowed by the action of the damper.

F. Embodiment FIG. 1 shows a partially sectioned front view of a vehicle restraint system according to one embodiment of the present invention, and FIGS. FIGS. 5 and 5 show the plane and side surface of FIG. Further, FIGS. 6 and 7 show a plane and a side surface of a chassis dynamometer provided with the vehicle restraint device. In this embodiment, a damper is provided in the tracking mechanism section.

As shown in FIG. 6 and FIG. 7, rollers 11a, 11b, 12a, 12b are rotatably arranged in front, rear, left and right below the pit cover 10 which is a floor surface, and the front rollers 12a, 12b are It cannot move in the front-back direction, but the front rollers 11a, 11
The b is slidably mounted on the slide rail 9 and can be moved in the front-rear direction. That is, the rear roller 11
A slider 8 for supporting a and 11b is slidably mounted on a slide rail 9 in the front-rear direction, and a screw shaft 13 penetrating through the slider 8 for screwing is rotatably supported and connected to a motor 14. There is. Therefore, when the screw shaft 13 is rotated by the motor 14, the slider 8 and the rollers 11a, 11b screwed onto the screw shaft 13 are rotated.
Screw back and forth.

The rollers 11a, 11b, 12a, 12b are connected to an absorber (not shown) via a speed increaser and a flywheel to form a load device, which is exposed from the pit cover 10.
Wheels 6 and 16 of a four-wheel drive vehicle 15 as a vehicle under test are placed on the upper side surfaces of 11a, 11b, 12a and 12b. Therefore, the wheels 6,16
When the drive is rotated, the rollers 11a, 11b, 12a, 12b
However, the chassis dynamometer to which the present invention can be applied is not limited to such. For example, in the case of a chassis dynamometer for testing a rear-wheel drive vehicle, a load device that shares the flywheel by rotating the front and rear rollers 11a, 11b, 12a, 12b in synchronization with a uniform speed gear or the like is used. May be used, and rollers 11a, 11b, 12
Instead of a and 12b, a steel belt or the like may be rotatably stretched, and the load device may be configured so that the wheels 6 and 16 can be placed on the steel belt and the like.

The vehicle restraint devices 17 are provided on both left and right sides of the rear wheel 16 so as to restrain the rear wheel 16 of the four-wheel drive vehicle 15. This vehicle restraint device 17 includes a base 18, a left and right link 19, and an up and down link 20.
And a link mechanism as a follow-up mechanism section, a damper 50, an attachment mechanism section 21, and the like.

The base 18 that forms the base of the vehicle restraint device 17 is a pit cover 10
It is fixed to a frame 22 provided in the front-rear direction to support, and a damper 50 is attached to these bases 18,
These dampers 50 support both lower end portions of the left and right links 19. Left and right links 19 are vertical frame 19c, lower frame (axis)
It is framed in a rectangular shape including 19d and an upper frame (shaft) 19e, and is connected to the base 18 via a bearing so that the lower frame 19d can rotate. Between the diagonals of the left and right links 19, reinforcements 19a, 19 are provided to increase rigidity in the front-back direction.
b is installed.

In the damper 50, 51 is a cylinder attached to the base 18, in which a short cylindrical sliding member 52 with a bottom is slidably provided, and inside the sliding member 52, a lower portion of the left and right links 19 is provided. An end of the frame 19d is rotatably supported by a thrust bearing 53 and a radial needle bearing 54. The lower frame 19
The end of d is not directly supported, but is supported by the bearings 53 and 54 through an end member fitted to the end.

On the other hand, an end plate 55 is attached to the outer end of the cylinder 51, and two types of compression springs 56 and 57 are provided between the inner surface of the end plate 55 and the outer surface of the sliding member 52. . Spring 56
Influences the slight movement of the left and right links 19 during normal operation,
It is provided so as to be stretched between the outer surface of the sliding member 52 and the inner surface of the end plate 55, that is, the lower frame 19d is provided with an axially inward spring force, but the other spring 57 is provided with a sudden acceleration / deceleration. It acts only for large movements with time, and therefore, in a normal state, a gap (margin) 1 is provided between the sliding member 52 and the end surface thereof. In this embodiment, in order to secure the gap l, a recess 58 is provided on the end surface of the sliding member 52. At the center of the end plate 55, a stopper bolt 59 is screwed through the cylinder 52, and a lock nut
It is fixed at 60. Tip surface 59 of this stopper bolt 59
a serves as a stopper surface, and acts to restrict the movement of the sliding member 52, that is, the left and right links 19 in the front-rear direction beyond the allowable range. A cast product or the like is used as the sliding member 52.

The upper and lower links 20 are framed in an isosceles triangle as shown in FIG. 4, and the bearing portions 20a, 20 provided on both sides of the bottom side thereof.
It is connected to the upper frame 19e of the left and right links 19 by b and can rotate about an axis parallel to the front-rear direction.

In this way, the left and right links 19 and the upper and lower links 20 are rotatable about an axis parallel to the front-rear direction, and the left and right links 19 are
Is movable in the front-rear direction via the damper 50, so that the mounting mechanism portion 21 supported on the tops of the vertical links 20.
Can move freely not only in the vertical and horizontal directions but also in the front-back direction.

As shown in FIG. 8, the mounting mechanism 21 includes a mounting shaft 28 having a flange 27 that is mounted on the wheel hub and a ball bearing.
The ball bearing 29 is supported by 29, and the ball bearing 29 is supported by the tip ends of the upper and lower links 20 via a spherical bearing 30. Therefore, with the mounting shaft 28 coupled to the wheel hub, the wheel 16 can freely rotate and swing in any direction.

In the vehicle restraint system having the above configuration, the wheels 16 are driven to rotate to rotate the rollers 11a to 12b, and even when the vehicle 15 causes yawing, pitching, and rolling during various tests, the left and right links 19 and the vertical link The link 20 and the attachment mechanism portion 21 operate, and the vehicle behaves in the same way as on an actual road.

Also, since the damper 50 allows the left and right links 19, the up and down links 20, and the mounting mechanism portion 21 to be integrally movable back and forth,
It becomes closer to the actual state without restraining the movement in the front-rear direction that occurs during sudden start, sudden stop, sudden acceleration, and sudden braking of the vehicle.

FIG. 9 shows the essential parts of another embodiment of the vehicle restraint system according to the present invention. In this embodiment, a damper 61 is provided on the mounting mechanism portion 21 shown in FIG. 8 so that it can be moved back and forth.

A frame 62 is attached to the front ends of the pair of vertical links 20 in parallel with the front-rear direction, and support brackets 63 are attached to both ends of the front-rear direction. A rod 65 is supported on each support bracket 63 via a support member 64 so as to be slidable and rotatable in the axial direction (front-back direction). A ring made of Teflon, a linear ball bearing, or the like is used as the support member 64. On the other hand, a mounting shaft 28 having a flange portion 27 that is mounted on the wheel hub of the wheel is rotatably supported by a ball bearing 29, and the ball bearing 29 is swingably supported by a spherical bearing 30. 30
The a is fixedly supported by the bearing frame 66. The rod 65 is connected to the bearing frame 66, and the spring 67 is provided between the bearing frame 66 and the support bracket 63. Therefore, the mounting shaft 28, the bearing 29,
The bearing frame 66 holding the 30 can move freely in the front-rear direction and can freely rotate.

In the vehicle restraint system according to this embodiment, the bearing frame 66 is allowed to move back and forth in the forward and backward directions that occur when the vehicle suddenly starts or stops. In this device, the front and rear end surfaces 66a of the bearing frame 66 are stopper surfaces, and the stopper surface 66a hits the support bracket 63, whereby movement of the bearing frame 66 beyond the allowable range is restricted. There is.

As another embodiment, the left and right links of the vertical link 20
It is conceivable that a damper is provided at the end of the connecting side of 19. The operation is the same as in the above two embodiments. Further, the dampers may be provided not only in any one of the above-mentioned three places (the lower portion of the left and right links 19, the attachment mechanism portion, the end portions of the upper and lower links 20) but also in two or more places.

G. Effect of the Invention According to the vehicle restraint device of the present invention, an attachment mechanism portion rotatably supporting an attachment shaft fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer, and the attachment. In a vehicle restraint device having a follow-up mechanism section that supports the mechanism section so as to be movable in the left-right direction and the up-down direction, a damper is provided in the attachment mechanism section or the follow-up mechanism section or both, and the attachment mechanism section or the follow-up mechanism section. Alternatively, since both can be moved in the front-rear direction, movement in the front-rear direction that occurs when the vehicle suddenly starts or suddenly stops can be allowed, and the test can be performed in a state closer to the actual running state. The measurement error is reduced and the reliability of the measurement result is improved.

[Brief description of drawings]

FIG. 1 is a front view of a vehicle restraint system according to an embodiment of the present invention, which is a partial cross section, and FIG. 2 is an enlarged view of a damper portion thereof.
The figure is an enlarged view of part III in FIG. 2, and FIGS. 4 and 5 are the first view.
6 and 7 are a plan view and a side view of the chassis dynamometer equipped with the vehicle restraint device, and FIG. 8 is a cross-sectional view taken along the plane of the mounting mechanism portion, and FIG. Is a cross-sectional view of a main part of a vehicle restraint system according to another embodiment, and FIG.
FIG. In the drawing, 11a, 11b, 12a, 12b are rollers, 15 is a vehicle under test, 17 is a vehicle restraint device, 19 is a left and right link, 20 is a vertical link, 21 is a mounting mechanism part, 50 is a damper, 56 and 57 are springs. , 59 is a stopper bolt, 61 is a damper, 64 is a support member, 66 is a bearing frame, and 67 is a spring.

Claims (1)

[Scope of utility model registration request] 1. A mounting mechanism part for rotatably supporting a mounting shaft fixed to a wheel hub of a wheel mounted on a load device of a chassis dynamometer, and the mounting mechanism part is movable in a horizontal direction and a vertical direction. In a vehicle restraint device having a follow-up mechanism section that supports the above, the mounting mechanism section or the follow-up mechanism section or both are provided with dampers so that the attachment mechanism section or the follow-up mechanism section or both can move in the front-rear direction. A vehicle restraint device characterized by the above.